215/45R17 tire size in inches

A 215/45R17 tire measures

24.6" tall × 8.5" wide

3.81" sidewall on a 17" wheel. 819 revolutions per mile.

215/45R17 means a tire 215 mm wide, with sidewalls 45% as tall as the tire is wide (97 mm), radial construction (R), for a 17 inch wheel.

24.6"17" rim3.8"8.5" wide
215/45R17: 24.6 inches tall, 8.5 inches wide, on a 17 inch rim, drawn to scale

215/45R17 specs

Overall diameter (height)24.62 inches (625 mm)
Section width8.46 inches (215 mm)
Sidewall height3.81 inches (97 mm)
Wheel (rim) diameter17 inches
Circumference77.3 inches (1,964 mm)
Revolutions per mile819
Revolutions per kilometer509
Approximate rim width7.0" to 8.5"
In inches (flotation style)24.6x8.5R17
Aspect ratio45%

Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.

Sizes that can replace 215/45R17 on a 17" wheel

These 17" sizes are within 3% of 215/45R17's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
275/35R1724.58"10.83"−0.2%59.9 mphCompare
195/50R1724.68"7.68"+0.2%60.1 mphCompare
245/40R1724.72"9.65"+0.4%60.2 mphCompare
235/40R1724.40"9.25"−0.9%59.5 mphCompare
285/35R1724.85"11.22"+1.0%60.6 mphCompare
265/35R1724.30"10.43"−1.3%59.2 mphCompare
185/50R1724.28"7.28"−1.4%59.2 mphCompare
225/45R1724.97"8.86"+1.4%60.9 mphCompare
205/45R1724.26"8.07"−1.4%59.1 mphCompare
185/55R1725.01"7.28"+1.6%61.0 mphCompare
255/40R1725.03"10.04"+1.7%61.0 mphCompare
205/50R1725.07"8.07"+1.8%61.1 mphCompare

Same height on other wheel sizes (plus and minus sizing)

SizeWheelDiameterDifference
235/25R2020"24.63"0.0%Compare
245/55R1414"24.61"0.0%Compare
285/25R1919"24.61"0.0%Compare
225/60R1414"24.63"0.0%Compare
175/70R1515"24.65"+0.1%Compare
245/50R1515"24.65"+0.1%Compare
205/35R1919"24.65"+0.1%Compare
185/80R1313"24.65"+0.1%Compare
275/40R1616"24.66"+0.2%Compare
245/60R1313"24.57"−0.2%Compare
245/45R1616"24.68"+0.3%Compare
205/60R1515"24.69"+0.3%Compare

One size up or down

Compare 215/45R17 with another size

With 225/45R17 tires, when your speedometer says 60 mph you are really going

60.9 mph

225/45R17 is +0.35 inches (+1.4%) in overall diameter. That is within the 3% most shops and makers allow.

215/45R17225/45R17Difference%
Overall diameter24.62"24.97"+0.35"+1.4%
Section width8.46"8.86"+0.39"+4.7%
Sidewall height3.81"3.99"+0.18"+4.7%
Circumference77.34"78.45"+1.11"+1.4%
Revolutions per mile819.2807.6−11.6−1.4%

Questions

How tall is a 215/45R17 tire?
A 215/45R17 tire is 24.6 inches tall (625 mm), calculated from the size. It is 8.5 inches wide with 3.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 215/45R17 mean?
215/45R17 means a tire 215 mm wide, with sidewalls 45% as tall as the tire is wide (97 mm), radial construction (R), for a 17 inch wheel.
How many revolutions per mile does a 215/45R17 tire make?
About 819 revolutions per mile, based on a circumference of 77.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 215/45R17 tire?
Roughly 7.0" to 8.5". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 275/35R17 instead of 215/45R17?
275/35R17 is −0.04 inches (−0.2%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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